On the issue of key on engine off random numbers, I think you will find that it is the o2 sensor wires, when the o2 heater is active prior to starting. In the most recent software they sent me for Go efi 4 power adder version, it has a setting to turn the pre heat off, and that got rid of those Key on engine off random tach numbers.
It should save your main settings, even with the battery disconnected.
Ken
